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Optical brighteners are fluorescent plasticizers and illuminate colours or overlap yellow discoloration of plastics, coatings, colours and fibers by absorbing invisible UV-radiation on the one side and by visualizing in the blew light spectra on the other side. Optical brighteners are excellent against yellowing, which occurs in polymers and fibres during processing at high temperature. They are also part of substrates with pigments or colorants resulting in a gloomy effect.
Optical brighteners are also conditioners and give a high degree of whiteness due to a chemical bond with fluorescent properties, which are similar used like colorants in plastics with brightening effects. Optical brighteners can also be used as fluorescence indicator of various materials and applications.